Here's another way to look at potentially avoidable complications

Potentially Avoidable Complication events can also be used to produce a quality performance measure for each hospital. The Potentially Avoidable Complication Rate is the share of a hospital’s patient episodes that included one or more complications. A low (below average) PAC rate means most patients did not experience a complication and is an indicator of high quality care. A high (above average) PAC rate means larger numbers of patients experienced at least one complication and indicates low quality care.